The initial conditions for cosmological perturbations in fact consists of two parts: when and which? However, both questions are related to each other. In LQC literature, for cosmological perturbations, two different moments have been chosen so far in the dressed and hybrid approaches:
(i) the remote past in the contracting phase [1]} and (ii) the bounce [2]}, [3]}, [4]}. To see which conditions we need to impose at a given moment, let us first recall how to impose the initial conditions in GR, in which the
scalar perturbations are governed by the equation,
\(v_k^{\prime \prime } + \left(k^2 - \frac{z^{\prime \prime }}{z}\right)v_k = 0,\) 
